I cant progress with Rails 3.2 anymore because of all of these attr_accessible issues

I have been littering stack overflow with quetsions trying to get the books code to work with Rails 3.2 I’m using the fourth edition. Apparently it was designed to work before these MassAssignment security warnings. Now I’m stuck at the following:

P2.2 was based on Rails 3.2.0. The mass assignment changes were introduced in Rails 3.2.3. For what it is worth, the mass assignment changes were removed in Rails 4.0 and strong parameters was added.

It is indeed hard to learn a framework as big as Rails when you are using a version different than the one covered by the book. At this point, I would recommend following the instructions in section 1.4: